Now that we have a DMEM region per CMA region, we can track the allocations of the CMA heap through DMEM.
Signed-off-by: Maxime Ripard mripard@kernel.org --- drivers/dma-buf/heaps/cma_heap.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index 9512d050563a9ad0a735230c4870c3d3b3b01b25..4951c41db3ba0cbd903b6d62787f51b83f4a1e7e 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -7,10 +7,11 @@ * * Also utilizing parts of Andrew Davis' SRAM heap: * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ * Andrew F. Davis afd@ti.com */ +#include <linux/cgroup_dmem.h> #include <linux/cma.h> #include <linux/dma-buf.h> #include <linux/dma-heap.h> #include <linux/dma-map-ops.h> #include <linux/err.h> @@ -276,23 +277,31 @@ static struct dma_buf *cma_heap_allocate(struct dma_heap *heap, unsigned long len, u32 fd_flags, u64 heap_flags) { struct cma_heap *cma_heap = dma_heap_get_drvdata(heap); + struct dmem_cgroup_pool_state *pool; struct cma_heap_buffer *buffer; DEFINE_DMA_BUF_EXPORT_INFO(exp_info); size_t size = PAGE_ALIGN(len); pgoff_t pagecount = size >> PAGE_SHIFT; unsigned long align = get_order(size); struct page *cma_pages; struct dma_buf *dmabuf; int ret = -ENOMEM; pgoff_t pg;
+ ret = dmem_cgroup_try_charge(cma_get_dmem_cgroup_region(cma_heap->cma), + size, &pool, NULL); + if (ret) + return ERR_PTR(ret); + buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); - if (!buffer) - return ERR_PTR(-ENOMEM); + if (!buffer) { + ret = -ENOMEM; + goto uncharge_cgroup; + }
INIT_LIST_HEAD(&buffer->attachments); mutex_init(&buffer->lock); buffer->len = size;
@@ -348,18 +357,23 @@ static struct dma_buf *cma_heap_allocate(struct dma_heap *heap, dmabuf = dma_buf_export(&exp_info); if (IS_ERR(dmabuf)) { ret = PTR_ERR(dmabuf); goto free_pages; } + + dmabuf->cgroup_pool = pool; + return dmabuf;
free_pages: kfree(buffer->pages); free_cma: cma_release(cma_heap->cma, cma_pages, pagecount); free_buffer: kfree(buffer); +uncharge_cgroup: + dmem_cgroup_uncharge(pool, len);
return ERR_PTR(ret); }
static const struct dma_heap_ops cma_heap_ops = {